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A 65-year-old woman presents with a 2-day history of vertigo, nausea, and vomiting. The vertigo is constant and severe, worsened by head movement. She has no hearing loss or tinnitus. On examination, she has horizontal nystagmus that does not change direction with gaze and is suppressed by visual fixation. Head impulse test is abnormal (corrective saccade present). What is the most likely diagnosis?

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